ADS-919 14-Bit, 2MHz, Low-Power Sampling A/D Converters PRODUCT OVERVIEW The ADS-919 is a high-performance, 14-bit, 2MHz sampling A/D converter. This device accurately samples full-scale input signals up to Nyquist frequencies with no missing codes. The ADS-919 features outstanding dynamic performance including a THD of –74dB. Housed in a small 24-pin DDIP or SMT (gullwing) package, the functionally complete ADS-919 contains a fast-settling sample-hold amplifier, a subranging (two-pass) A/D converter, a precise voltage reference, timing/control logic, and error correction circuitry. Digital input and output levels are TTL. Requiring ±15V (or ±12V) and +5V supplies, the ADS-919 typically dissipates 1.8W (1.5W for ±12V). The unit is offered with a unipolar input (0 to +10V). There are four models of the ADS-919 covering three operating temperature ranges, 0 to +70°C, -40 to +100°C, –55 to +125°C and one high reliability “883” model is also available. All models are housed in the same ceramic package. Each model is available in Non-RoHS version or RoHS compliant (-C) version. Applications include radar, sonar, spectrum analysis, and graphic/ medical imaging. FEATURES 14-bit resolution 2MHz sampling rate PIN FUNCTION INPUT/OUTPUT CONNECTIONS PIN FUNCTION 1 BIT 14 (LSB) 24 –12V/–15V SUPPLY No missing codes 2 BIT 13 23 ANALOG GROUND Functionally complete 3 BIT 12 22 +12V/+15V SUPPLY 4 BIT 11 21 +10V REFERENCE OUT 5 BIT 10 20 ANALOG INPUT Low power, 1.8 Watts 6 BIT 9 19 ANALOG GROUND Operates from ±15V or ±12V supplies & +5V supply Edge-triggered; No pipeline delays 7 BIT 8 18 BIT 1 (MSB) 8 BIT 7 17 BIT 2 9 BIT 6 16 START CONVERT 10 BIT 5 15 EOC Unipolar 0 to +10V input range (for bipolar ±5V input range see ADS-929) 11 BIT 4 14 DIGITAL GROUND 12 BIT 3 13 +5V SUPPLY Small 24-pin DDIP or SMT package BLOCK DIAGRAM DAC 18 BIT 1 (MSB) 17 BIT 2 +10V REF. OUT 21 REF REGISTER FLASH ADC S/H ANALOG INPUT 20 S1 DIGITAL CORRECTION LOGIC 12 BIT 3 S2 BUFFER – REGISTER + 11 BIT 4 10 BIT 5 9 BIT 6 8 BIT 7 7 BIT 8 6 BIT 9 5 BIT 10 4 BIT 11 3 BIT 12 2 BIT 13 1 BIT 14 (LSB) START CONVERT 16 TIMING AND CONTROL LOGIC EOC 15 13 14 22 19, 23 24 +5V SUPPLY DIGITAL GROUND +12V/+15V SUPPLY ANALOG GROUND –12V/–15V SUPPLY Figure 1. ADS-919 Functional Block Diagram DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected] MDA_ADS-919.C02 Page 1 of 9 ADS-919 14-Bit, 2MHz, Low-Power Sampling A/D Converters ABSOLUTE MAXIMUM RATINGS LIMITS PARAMETERS 0 to +16 +12V/+15V Supply (Pin 22) 0 to –16 –12V/–15V Supply (Pin 24) 0 to +6 +5V Supply (Pin 13) –0.3 to +VDD +0.3 Digital Input (Pin 16) –4 to +17 Analog Input (Pin 20) +300 Lead Temperature (10 seconds) PHYSICAL/ENVIRONMENTAL MIN. TYP. MAX. UNITS PARAMETERS Operating Temp. Range, Case 0 — +70 °C ADS-919MC, GC 0 — +70 °C ADS-919MC-C, GC -C –40 — +100 °C ADS-919ME, GE –40 — +100 °C ADS-919ME-C, GE -C –55 — +125 °C ADS-919MM, GM –55 — +125 °C ADS-919MM-QL*, GM-QL* –55 — +125 °C ADS-919MM-C, GM-C –55 — +125 °C ADS-919MM-QL-C*, GM-QL-C* –55 — +125 °C ADS-919/883*, ADS-919G/883* –55 — +125 °C ADS-919-C/883*, ADS-919G-C/883* Thermal Impedance — 6 — °C/Watt θjc — 24 — °C/Watt θca –65 — +150 °C Storage Temperature Range 24-pin, metal-sealed, ceramic DDIP or SMT Package Type 0.42 ounces (12 grams) Weight *Environmental tests (PIND, Gross & fine leak, Temperature cycling, Burn-in) are performed in addition to the MM electrical specifications. UNITS Volts Volts Volts Volts Volts °C FUNCTIONAL SPECIFICATIONS (TA = +25°C, ±VCC = ±15V (or ±12V), +VDD = +5V, 2MHz sampling rate, and a minimum 1 minute warmup ➀ unless otherwise specified.) ANALOG INPUT Input Voltage Range ➁ Input Resistance Input Capacitance DIGITAL INPUT Logic Levels Logic "1" Logic "0" Logic Loading "1" Logic Loading "0" Start Convert Positive Pulse Width ➂ STATIC PERFORMANCE Resolution Integral Nonlinearity (fin = 10kHz) Differential Nonlinearity (fin = 10kHz) Full Scale Absolute Accuracy Unipolar Offset Error (Tech Note 2) Gain Error (Tech Note 2) No Missing Codes (fin = 10kHz) DYNAMIC PERFORMANCE Peak Harmonics (–0.5dB) dc to 500kHz 500kHz to 1MkHz Total Harmonic Distortion (–0.5dB) dc to 500kHz 500kHz to 1MkHz Signal-to-Noise Ratio (w/o distortion, –0.5dB) dc to 500kHz 500kHz to 1MkHz Signal-to-Noise Ratio ➃ (& distortion, –0.5dB) dc to 500kHz 500kHz to 1MkHz Two-tone Intermodulation Distortion (fin = 200kHz, 500kHz, fs = 2MHz –0.5dB) Noise Input Bandwidth (–3dB) Small Signal (–20dB input) Large Signal (–0.5dB input) Feedthrough Rejection (fin = 1MHz) Slew Rate Aperture Delay Time Aperture Uncertainty S/H Acquisition Time (to ±0.003%FSR, 10V step) Overvoltage Recovery Time ➄ A/D Conversion Rate MIN. — — — 0 TO +70°C TYP. 0 to +10 1 7 MAX. — — 15 MIN. — — — –40 TO +85°C TYP. 0 to +10 1 7 MAX. — — 15 MIN. — — — –55 TO +125°C TYP. 0 to +10 1 7 MAX. — — 15 UNITS Volts kΩ pF +2.0 — — — 20 — — — — 200 — +0.8 +20 –20 — +2.0 — — — 20 — — — — 200 — +0.8 +20 –20 — +2.0 — — — 20 — — — — 200 — +0.8 +20 –20 — Volts Volts μA μA ns — — — — — — 14 14 ±0.5 ±0.5 ±0.1 ±0.1 ±0.1 — — — +0.95 ±0.3 ±0.25 ±0.3 — — — — — — — 14 14 ±0.75 ±0.5 ±0.2 ±0.2 ±0.3 — — — ±0.95 ±0.4 ±0.4 ±0.5 — — — — — — — 14 14 ±1 ±0.5 ±0.4 ±0.4 ±0.5 — — — +0.99 ±0.8 ±1.25 ±1 — Bits LSB LSB %FSR %FSR % Bits — — –76 –76 –72 –70 — — –76 –76 –70 –70 — — –74 –74 –69 –69 dB dB — — –74 –74 –70 –70 — — –74 –74 –70 –70 — — –73 –73 –69 –68 dB dB 74 74 77 77 — — 74 74 77 77 — — 71 71 76 75 — — dB dB 70 70 74 74 — — 70 70 74 74 — — 68 68 73 72 — — dB dB — — –80 300 — — — — –80 350 — — — — –79 450 — — dB μVrms — — — — — — 9 8 82 ±200 ±20 5 — — — — — — — — — — — — 9 8 82 ±200 ±20 5 — — — — — — — — — — — — 9 8 82 ±200 ±20 5 — — — — — — MHz MHz dB V/μs ns ps rms 150 — 2 190 400 — 230 500 — 150 — 2 190 400 — 230 500 — 150 — 2 190 400 — 230 500 — ns ns MHz DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected] MDA_ADS-919.C02 Page 2 of 9 ADS-919 14-Bit, 2MHz, Low-Power Sampling A/D Converters ANALOG OUTPUT Internal Reference Voltage Drift External Current DIGITAL OUTPUTS Logic Levels Logic "1" Logic "0" Logic Loading "1" Logic Loading "0" Delay, Falling Edge of EOC to Output Data Valid Output Coding POWER REQUIREMENTS , ±15V Power Supply Ranges +15V Supply –15V Supply +5V Supply Power Supply Currents +15V Supply –15V Supply +5V Supply Power Dissipation Power Supply Rejection POWER REQUIREMENTS, ±12V Power Supply Ranges +12V Supply –12V Supply +5V Supply Power Supply Currents +12V Supply –12V Supply +5V Supply Power Dissipation ±12V Power Dissipation ±15V Power Supply Rejection MIN. 0 TO +70°C TYP. MAX. MIN. –40 TO +85°C TYP. MAX. MIN. –55 to +125°C TYP. MAX. UNITS +9.95 — — +10.0 ±5 — +10.05 — 1.5 +9.95 — — +10.0 ±5 — +10.05 — 1.5 +9.95 — — +10.0 ±5 — +10.05 — 1.5 Volts ppm/°C mA +2.4 — — — — — — — — +0.4 –4 +4 +2.4 — — — — — — — — +0.4 –4 +4 +2.4 — — — — — — — — +0.4 –4 +4 Volts Volts mA mA 35 — — 35 — — 35 ns — — Straight Binary +14.5 –14.5 +4.75 +15.0 –15.0 +5.0 +15.5 –15.5 +5.25 +14.5 –14.5 +4.75 +15.0 –15.0 +5.0 +15.5 –15.5 +5.25 +14.5 –14.5 +4.75 +15.0 –15.0 +5.0 +15.5 –15.5 +5.25 Volts Volts Volts — — — — — +45 –45 +85 1.8 — +65 –60 +95 2.2 ±0.02 — — — — — +45 –45 +85 1.8 — +65 –60 +95 2.2 ±0.02 — — — — — +45 –45 +85 1.8 — +65 –60 +95 2.2 ±0.02 mA mA mA Watts %FSR/%V +11.5 –11.5 +4.75 +12.0 –12.0 +5.0 +12.5 –12.5 +5.25 +11.5 –11.5 +4.75 +12.0 –12.0 +5.0 +12.5 –12.5 +5.25 +11.5 –11.5 +4.75 +12.0 –12.0 +5.0 +12.5 –12.5 +5.25 Volts Volts Volts — — — — — — +45 –45 +85 1.5 1.8 — +65 –60 +95 1.7 2.2 ±0.02 — — — — — — +45 –45 +85 1.5 1.8 — +65 –60 +95 1.7 2.2 ±0.02 — — — — — — +45 –45 +85 1.5 1.8 — +65 –60 +95 1.7 2.2 ±0.02 mA mA mA Watts Watts %FSR/%V ➃ Effective bits is equal to: Footnotes: ➀ All power supplies must be on before applying a start convert pulse. All supplies and the clock (START CONVERT) must be present during warmup periods. The device must be continuously converting during this time. There is a slight degradation in performance when using ±12V supplies. ➁ See Ordering Information for availability of ±5V input range. Contact DATEL for availability of other input voltage ranges. ➂ A 2MHz clock with a 200ns wide start convert pulse is used for all production testing. See Timing Diagram for more details. (SNR + Distortion) – 1.76 + 20 log 6.02 ➄ This is the time required before the A/D output data is valid once the analog input is back within the specified range. TECHNICAL NOTES 1. Obtaining fully specified performance from the ADS-919 requires careful attention to pc-card layout and power supply decoupling. The device's analog and digital ground systems are connected to each other internally. For optimal performance, tie all ground pins (14, 19 and 23) directly to a large analog ground plane beneath the package. can be reduced to zero using the input circuit of Figure 2. When using this circuit, or any similar offset and gain-calibration hardware, make adjustments following warmup. To avoid interaction, always adjust offset before gain. 3. When operating the ADS-919 from ±12V supplies, do not drive external circuitry with the REFERENCE OUTPUT. The reference's accuracy and drift specifications may not be met, and loading the circuit may cause accuracy errors within the converter. Bypass all power supplies and the REFERENCE OUTPUT (pin 21) to ground with 4.7μF tantalum capacitors in parallel with 0.1μF ceramic capacitors. Locate the bypass capacitors as close to the unit as possible. If the userinstalled offset and gain adjusting circuit shown in Figure 2 is used, also locate it as close to the ADS-919 as possible. 2. The ADS-919 achieves its specified accuracies without the need for external calibration. If required, the device's small initial offset and gain errors DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA Full Scale Amplitude Actual Input Amplitude 4. Applying a start convert pulse while a conversion is in progress (EOC = logic "1") initiates a new and inaccurate conversion cycle. Data from the interrupted and subsequent conversions will be invalid. • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected] MDA_ADS-919.C02 Page 3 of 9 ADS-919 14-Bit, 2MHz, Low-Power Sampling A/D Converters CALIBRATION PROCEDURE (Refer to Figures 2 and 3) Gain adjusting is accomplished when all bits are 1's and the LSB just changes from a 1 to a 0. This transition ideally occurs when the analog input is at +full scale minus 1½ LSB's (+9.999085V). Any offset and/or gain calibration procedures should not be implemented until devices are fully warmed up. To avoid interaction, offset must be adjusted before gain. The ranges of adjustment for the circuit of Figure 2 are guaranteed to compensate for the ADS-919's initial accuracy errors and may not be able to compensate for additional system errors. Zero/Offset Adjust Procedure All fixed resistors in Figure 2 should be metal-film types, and multiturn potentiometers should have TCR’s of 100ppm/°C or less to minimize drift with temperature. 2. Apply +305μV to the ANALOG INPUT (pin 20). 1. Apply a train of pulses to the START CONVERT input (pin 16) so the converter is continuously converting. If using LED's on the outputs, a 200kHz conversion rate will reduce flicker. A/D converters are calibrated by positioning their digital outputs exactly on the transition point between two adjacent digital output codes. This can be accomplished by connecting LED's to the digital outputs and adjusting until certain LED's "flicker" equally between on and off. Other approaches employ digital comparators or microcontrollers to detect when the outputs change from one code to the next. For the ADS-919, offset adjusting is normally accomplished at the point where the output bits are 0's and the LSB just changes from a 0 to a 1. This digital output transition ideally occurs when the applied analog input is +½ LSB (+305μV). 3. Adjust the offset potentiometer until the output bits are all 0's and the LSB flickers between 0 and 1. Gain Adjust Procedure 1. Apply +9.999085V to the ANALOG INPUT (pin 20). 2. Adjust the gain potentiometer until the output bits are all 1's and the LSB flickers between 1 and 0. Table 1. Zero and Gain Adjust +15V ZERO/ OFFSET ADJUST 20k7 –15V 200k7 INPUT VOLTAGE RANGE ZERO ADJUST +½ LSB GAIN ADJUST +FS –1½ LSB 0 to +10V +305μV +9.999085V 2k7 Table 2. Output Coding GAIN ADJUST DIGITAL OUTPUT +15V 1.98k7 SIGNAL INPUT To Pin 20 of ADS-919 507 INPUT VOLTAGE (0 TO +10V) UNIPOLAR SCALE +9.999390 +FS –1LSB 11 1111 1111 1111 +7.500000 +3/4 FS 11 0000 0000 0000 +5.000000 +1/2 FS 10 0000 0000 0000 +2.500000 +1/4 FS 01 0000 0000 0000 +0.000610 +1LSB 00 0000 0000 0001 0.000000 0 00 0000 0000 0000 15V Figure 2. ADS-919 Calibration Circuit OFFSET MSB BINARY LSB Coding is straight binary; 1LSB = 610μV. Figure 3. Typical ADS-919 Connection Diagram DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected] MDA_ADS-919.C02 Page 4 of 9 ADS-919 14-Bit, 2MHz, Low-Power Sampling A/D Converters THERMAL REQUIREMENTS All DATEL sampling A/D converters are fully characterized and specified over operating temperature (case) ranges of 0 to +70°C and –55 to +125°C. All room-temperature (TA = +25°C) production testing is performed without the use of heat sinks or forced-air cooling. Thermal impedance figures for each device are listed in their respective specification tables. These devices do not normally require heat sinks, however, standard precautionary design and layout procedures should be used to ensure devices do not overheat. The ground and power planes beneath the package, as well as all pcb signal runs to and from the device, should be as heavy as possible to help conduct heat away from the package. Electrically-insulating, thermally-conductive "pads" may be installed underneath the package. Devices should be soldered to boards rather than "socketed," and of course, minimal air flow over the surface can greatly help reduce the package temperature. Notes: 1. fs = 2MHz. 2. The ADS-919 is an edge-triggered device. All internal operations are triggered by the rising edge of the start convert pulse, which may be as narrow as 20nsec. All production testing is performed at a 2MHz sampling rate with 200nsec wide start pulses. For lower sampling rates, wider start pulses may be used, however, a minimum pulse width low of 20nsec must be maintained. Figure 4. ADS-919 Timing Diagram DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected] MDA_ADS-919.C02 Page 5 of 9 ADS-919 Figure 5. ADS-919 Evaluation Board Schematic 14-Bit, 2MHz, Low-Power Sampling A/D Converters DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected] MDA_ADS-919.C02 Page 6 of 9 ADS-919 14-Bit, 2MHz, Low-Power Sampling A/D Converters Figure 6. ADS-919 FFT Analysis Figure 7. ADS-919 Histogram and Differential Nonlinearity DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected] MDA_ADS-919.C02 Page 7 of 9 ADS-919 14-Bit, 2MHz, Low-Power Sampling A/D Converters MECHANICAL DIMENSIONS INCHES (mm) 1.31 MAX. (33.27) 24-Pin DDIP Versions ADS-919MC ADS-919ME ADS-919MM ADS-919/883 ADS-919MC-C ADS-919ME-C ADS-919MM-C ADS-919-C/883 24 Dimension Tolerances (unless otherwise indicated): 2 place decimal (.XX) ±0.010 (±0.254) 3 place decimal (.XXX) ±0.005 (±0.127) 13 0.80 MAX. (20.32) 1 Lead Material: Kovar alloy Lead Finish: 50 microinches (minimum) gold plating over 100 microinches (nominal) nickel plating 12 0.100 TYP. (2.540) 1.100 (27.940) 0.235 MAX. (5.969) PIN 1 INDEX 0.200 MAX. (5.080) 0.010 (0.254) 0.190 MAX. (4.826) 0.100 (2.540) 0.100 (2.540) 0.600 ±0.010 (15.240) SEATING PLANE 0.025 (0.635) 0.040 (1.016) 0.018 ±0.002 (0.457) +0.002 –0.001 1.31 MAX. (33.02) 24-Pin Surface Mount Versions ADS-919GC ADS-919GE ADS-919GM ADS-919G/883 ADS-919GC-C ADS-919GE-C ADS-919GM-C ADS-919G-C/883 Dimension Tolerances (unless otherwise indicated): 2 place decimal (.XX) ±0.010 (±0.254) 3 place decimal (.XXX) ±0.005 (±0.127) 13 24 0.80 MAX. (20.32) 1 0.190 MAX. (4.826) Lead Material: Kovar alloy Lead Finish: 50 microinches (minimum) gold plating over 100 microinches (nominal) nickel plating 12 0.020 TYP. (0.508) 0.060 TYP. (1.524) PIN 1 INDEX 0.100 (2.540) 0.100 TYP. (2.540) 0.015 (0.381) MAX. radius for any pin 0.130 TYP. (3.302) 0.020 (0.508) 0.010 TYP. (0.254) 0.040 (1.016) DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected] MDA_ADS-919.C02 Page 8 of 9 ADS-919 14-Bit, 2MHz, Low-Power Sampling A/D Converters ORDERING INFORMATION OPERATING TEMP. RANGE 0 to +70°C ANALOG INPUT PACKAGE Unipolar (0 to +10V) 24-Pin DDIP No ADS-919MC-C 0 to +70°C Unipolar (0 to +10V) 24-Pin DDIP Yes ADS-919GC 0 to +70°C Unipolar (0 to +10V) 24-Pin SMT No ADS-919GC-C 0 to +70°C Unipolar (0 to +10V) 24-Pin SMT Yes ADS-919ME –40 to +100°C Unipolar (0 to +10V) 24-Pin DDIP No ADS-919ME-C –40 to +100°C Unipolar (0 to +10V) 24-Pin DDIP Yes ADS-919GE –40 to +100°C Unipolar (0 to +10V) 24-Pin SMT No ADS-919GE-C –40 to +100°C Unipolar (0 to +10V) 24-Pin SMT Yes ADS-919MM –55 to +125°C Unipolar (0 to +10V) 24-Pin DDIP No ADS-919MM-QL –55 to +125°C Unipolar (0 to +10V) 24-Pin DDIP No ADS-919MM-C –55 to +125°C Unipolar (0 to +10V) 24-Pin DDIP Yes ADS-919MM-QL-C –55 to +125°C Unipolar (0 to +10V) 24-Pin DDIP Yes ADS-919GM –55 to +125°C Unipolar (0 to +10V) 24-Pin SMT No ADS-919GM-QL –55 to +125°C Unipolar (0 to +10V) 24-Pin SMT No ADS-919GM-C –55 to +125°C Unipolar (0 to +10V) 24-Pin SMT Yes ADS-919GM-QL-C –55 to +125°C Unipolar (0 to +10V) 24-Pin SMT Yes ADS-919/883 –55 to +125°C Unipolar (0 to +10V) 24-Pin DDIP No ADS-919-C/883 –55 to +125°C Unipolar (0 to +10V) 24-Pin DDIP Yes ADS-919G/883 –55 to +125°C Unipolar (0 to +10V) 24-Pin SMT No ADS-919G-C/883 –55 to +125°C Unipolar (0 to +10V) 24-Pin SMT Yes MODEL NUMBER ADS-919MC ROHS For bipolar analog input ±5V see ADS-929 data sheet. ADS-B919/929 ACCESSORIES Evaluation Board (without ADS-919) HS-24 Heat Sinks for all ADS-919/929 DDIP models Receptacles for PC board mounting can be ordered through AMP Inc. Part #3-331272-8 (Component Lead Socket), 24 required. For MIL-STD-883 product specifications, contact DATEL. * For information, see ADS-929 data sheet. DATEL is a registered trademark of DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA DATEL, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. ITAR and ISO 9001/14001 REGISTERED © 2015 DATEL, Inc. www.datel.com • e-mail: [email protected] MDA_ADS-919.C02 Page 9 of 9